My phone ring tone is ringing but no sound comes out when I play music,iPhone 4

Hey there, Brashi!

Thanks for using the Apple Support Communities. From your post, I understand that your ringtone will play without issue when you receive a call, but no other sounds will play. I use my iPhone's speakers every day in games, listening to music, and watching videos, so I know how important it is for your sound to be working. Luckily, I have some information that will help! Just follow the steps in the article linked below.

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker

Since we know you can hear your ringtones, you can skip steps 1 and 2. They walk you through verifying the alert sounds (like your ringtones and other alert sounds) work.

Cheers!